4000C2=\frac{4000!}{\left(4000-2\right)!\times2!} 7998000 number of ways
Frequently asked questions (FAQs)
What are the real solutions of the cubic equation x^3 + 2x^2 + x + 3 = 0?
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What is the resulting displacement when a vector of magnitude 10 units is added to a vector of magnitude 5 units, given that they are co-linear and point in the same direction?
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What is the eccentricity of an ellipse with major axis length 8 and minor axis length 6?